K. Abe et al., MEASUREMENT OF THE LEFT-RIGHT FORWARD-BACKWARD ASYMMETRY FOR CHARM QUARKS WITH D-ASTERISK+ AND D+ MESONS, Physical review letters, 75(20), 1995, pp. 3609-3613
We present a direct measurement of A(c) = 2 upsilon(c)a(c)/(upsilon(c)
(2) + a(c)(2)) from the left-right forward-backward asymmetry of D(+)
and D+ mesons in Z(0) events produced with the longitudinally polariz
ed SLAG Linear Collider beam. These Z(0) --> <c(c)over bar> events are
tagged on the basis of event kinematics and decay topology from a sam
ple of hadronic Z(0) decays recorded by the SLAG Large Detector. We me
asure A(c)(0) = 0.73 +/- 0.22(stat) +/- 0.10(syst).